获取、更新字段默认值

今天整理以前的资料，看到这个东西，挺偏门，记录下备忘吧。感谢园子里的朋友们。

DECLARE @ConsName VARCHAR(1000) ,
    @tableName VARCHAR(1000) ,
    @colName VARCHAR(1000)  


SELECT  @tableName = N'myOrder' ,
        @colName = 'ShipCountry'

SELECT  @ConsName = b.name
FROM    syscolumns a ,
        sysobjects b
WHERE   a.id = OBJECT_ID('myOrder')
        AND b.id = a.cdefault
        AND a.name = @colName
        AND b.name LIKE 'DF%' 


EXEC('alter table '+@tableName+ ' drop constraint '+@ConsName)

EXEC('ALTER TABLE '+@tableName+ ' ADD CONSTRAINT '+@ConsName+' DEFAULT (N''Italy'')  FOR '+@colName)

有更改，那查询就必须有的嘛。

-- =============================================
-- 获取表字段的默认值
-- =============================================

SELECT COLUMN_DEFAULT  FROM      INFORMATION_SCHEMA.COLUMNS  WHERE     TABLE_NAME = 'Employees' 


-- =============================================
-- 获取有默认值的字段
-- =============================================

SELECT  SO.NAME AS Name ,
        SC.NAME AS ColumnName ,
        SM.TEXT AS DefaultValue
FROM    dbo.sysobjects SO
        INNER JOIN dbo.syscolumns SC ON SO.id = SC.id
        LEFT JOIN dbo.syscomments SM ON SC.cdefault = SM.id
WHERE   SO.xtype = 'U'
        AND SM.TEXT IS NOT NULL -- AND SO.name='AuctionTstOrder'
ORDER BY SO.[name] ,
        SC.colid